Dimethyl ether (DME) has received considerable attention as a fuel additive to reduce the emission of particulate matter (PM) due to its low-temperature chemistry, molecularly bound oxygen atom and the absence of CC bonds. However, the effect of DME addition on the evolution of soot and particularly soot precursors is not entirely understood. This study aims to shed light on this issue by blending different proportions of DME with diffusion, E60, and partially premixed, PP12, base cases of laminar ethylene flames using the Yale benchmark burner. Laser-induced fluorescence (LIF) intensity and decay time are used to characterize the structure and evolution of soot precursors, while laser-induced incandescence (LII) is utilized to determine the soot volume fraction (SVF) and the effective primary particle diameter (D_p). For the diffusion flames, the addition of 10% DME increases the concentrations of both soot and soot precursors. With the further addition of DME to 20%, the SVF decreases to levels similar to those of E60 and then decreases further with 30% DME addition. All diffusion flames with DME addition exhibit higher concentrations of soot precursors than those of the reference E60 case. For PP12, the addition of 10% DME shows similar concentrations of soot precursors and a slight reduction in the SVF which continues to decrease with further increases in DME additions to the PP12 flame. The addition of DME seems to have little effect on the soot particle diameters for all the studied flames. Overall, the PP flames result in smaller mean particle diameters than the diffusion flame counterparts.

二甲醚（DME）由于其低温化学，分子键合的氧原子和不存在C C键，作为减少颗粒物（PM）排放的燃料添加剂受到了广泛的关注。但是，尚不完全理解DME添加对烟灰特别是烟灰前体的演变的影响。这项研究旨在通过使用Yale基准燃烧器将不同比例的DME与扩散E60和部分预混PP12层状乙烯火焰的基础案例混合，以阐明这一问题。激光诱导的荧光（LIF）强度和衰减时间用于表征烟尘前体的结构和演变，而激光诱导的白炽灯（LII）用于确定烟尘体积分数（SVF）和有效一次粒径（D _p）。对于扩散火焰，添加10％DME会增加烟灰和烟灰前体的浓度。随着DME进一步添加到20％，SVF下降到与E60相似的水平，然后在DME添加30％时进一步下降。所有添加DME的扩散火焰均比参考E60情况下的烟灰前体浓度更高。对于PP12，添加10％的DME显示出类似的烟灰前体浓度，并且SVF略有下降，随着DME添加到PP12火焰中的进一步增加，SVF持续下降。对于所有研究过的火焰，添加二甲醚似乎对烟灰粒径几乎没有影响。总体而言，PP火焰的平均粒径小于扩散火焰的平均粒径。